-1: setting the time. press and hold the mode button for 3 seconds to enter the time setting mode. the hour digits flash and can be set by pressing UP or DOWN to set the hours. use the same way to set the minutes. -2. setting the alarm. press the mode to view the alarm time. press mode pressed for 3 seconds to enter the alarm setting mode. the hour digits flash and can be set by pressing UP or DOWN to set the hours. use the same way to set the minutes. -3: calendar setting. press the mode to view the calendar.press mode for 3 seconds to enter the calendar setting mode. the year digits flash and can be set by pressing UP or DOWN to set the year. use the same way to set the month and day. -4: On / off alarm. press up to activate or deactivate the alarm. -5: Max / min. press the max / min key to see the maximum temperature and humidity log.press the max / min key to see the min temperature and humidity log.